How to dynamically call methods within a class using method-name assignment to a variable

Question

class MyClass:
    def __init__(self, i):
        self.i = i

    def get(self):
        func_name = 'function' + self.i
        self.func_name() # <-- this does NOT work.

    def function1(self):
        pass # do something

    def function2(self):
        pass # do something

This gives the error: TypeError: 'str' object is not callable

How would I go about doing this?

Note: self.func_name also does not work

Asked By: dev-vb

||

Source

Answer 1

def get(self):
      def func_not_found(): # just in case we dont have the function
         print 'No Function '+self.i+' Found!'
      func_name = 'function' + self.i
      func = getattr(self,func_name,func_not_found) 
      func() # <-- this should work!

Answered By: Joran Beasley

Answer 2

Two things:

In line 8 use,

func_name = ‘function’ + str(self.i)

Define a string to function mapping as,

  self.func_options = {'function1': self.function1,
                       'function2': self.function2
                       }

So it should look as:

class MyClass:

def __init__(self, i):
      self.i = i
      self.func_options = {'function1': self.function1,
                           'function2': self.function2
                           }
def get(self):
      func_name = 'function' + str(self.i)
      func = self.func_options[func_name]
      func() # <-- this does NOT work.

def function1(self):
      //do something

def function2(self):
      //do something

Answered By: sinhayash

How to dynamically call methods within a class using method-name assignment to a variable

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